<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8">
    <title></title>
  </head>
  <body>
    <script type="text/javascript">
function tulin(say) {
  var say = say;
  switch (say) {
    case '土豆':
    console.log('呦');
    break;
    case '呦':
    console.log('切克闹');
    break;
    default:
  }
}
tulin('土豆');
tulin('呦');
    </script>
  </body>
</html>
